Improvement in cupola-furnaces



UNITED STATES PATENT PHILIP MACKENZIE, OF BLAUVELTVILLE, NEW YORK.

IMPROVEMENT IN CUPOLA-FURNACES.

Specification forming part of Letters Patent No. 138,510, dated May 6,1873; application filed June 20, 1872.

To all whom it may concern:

Be it known that I, PHILIP W. MAoKENzrE. ofBlauveltville,in the countyof Rockland and State of New York, have invented a new and usefulImprovement in Furnaces for Metallurgical Purposes; and I do herebydeclare that the following is a full, clear, and exact description ofthe same, reference being had to the accompanying drawing forming a partof this specification, in which Figure 1 represents a sectionalelevation of a cupola-fur'nace having my invention applied to it; Fig.2, a vertical section, ,upon a larger scale, of two adjacent sections,in part, of a steam-generator used in and forming part of the invention;Fig. 3, a horizontalor transverse section of the same; Fig. 4., ahorizontal section of the-furnace at the line a: w in Fig. 1; Fig. 5, asimilar section at the line 3 y Fig. 6, a like section at the line 2 2.Fig. 7 is a detail horizontal sectional view of a modified constructionof the steam-generator.

Similar letters of reference indicate corresponding parts throughout theseveral figures of the drawing.

This invention is mainly designed'for the smelting of the preciousmeta-ls, such as gold and silver; but it is also applicable to inferiormetals, and may be used in cupolas for smelting iron ore. The inventionconsists in a combination, with the smelting-furnace, of asteamgenerator, heated by said furnace and by gases passing therefrom,anda steam-injector deriving its supply of steam from said generator andjetting it into a draft flue or flue's connected with the chimney ormain outlet for the escaping products of combustion, whereby theproducts of combustion are made to maintain the blast of the furnace.The invention also consists in certain peculiarities of con struction'and combinations or arrangements of parts, whereby the above result isobtained in a most perfectand advantageous manner, and great convenienceis afforded for fitting the whole together, as also for repairs, whennecessary, and for starting or operating the furnace under difierentconditions of its draft.

In the accompanyin g drawing, the invention is shown as applied to acupola-furnace embracing many or most of the essential features.described in Letters Patent originally issued to me August 25,1857, andsubsequently twice reissued and extended; but it is equally apmay eitherbe of brick, as shown at the right hand side of Fig. 1; or-may be of ahollow metal construction to contain water, as shown at the left hand ofsaid figure. When a waterbosh is used, then the feed-water to thesteamgenerator G, designed to be heated by the furnace, may beintroduced through said bosh by a pipe, b, and the bosh connect at itstop with the lower portion of the water-space of the generator. B is thebowl of the furnace, having atapspout, c; O, the bed brick; D, the sandhearth; and d d, the air-openings, by which the furnace is supplied withair. E is the lower, and F the upper, portion of the body of thefurnace, both of which, if desired, may be lined with brick, but thelower portion of which is here represented as not having its shelllined. The steamgenerator G- is arranged to surround the lower portion Eof the body, and, as shown in Figs. 1, 2, 3, 5, and 6 of the drawing, iscomposed of a number of vertical sections of polygonal shape in theirtransverse section, so as to form a compact body around .the furnace,and having tubular lines 6 and surrounding annular water-spaces fthrough them, the latter connecting with each other near their base bythimbles g, as shown in Figs. 2 and 3, and said annular spacesconnecting near their tops by branches with a surrounding steam-belt, h,from which the injector H draws its supply by a pipe or pipes, i 70,from which steam may be taken by a branch or extension of the pipe 70 todrive an engine, or for any other purpose that steam may be required.The pipe 7c may also be used, on opening a cock, I, to supply theinjector with steam from an independent steamboiler for the purpose ofstarting the furnace, during which a cook, or, in the pipe 2' should beclosed; but after steam of the necessary pressure is formed in thegenerator G, then the cock m is opened, and the cock Z may be closed.When the generator G is not connected with a water-bosh, then the watermay be fed to it by a pipe, a.

l The hereinbetore-described construction of the generator G is a veryadvantageous one, not only on account of the convenience with FFICE.

which the generator may be erected around the body of the furnace, andits sections be rei downward draft of heated gases from the furnacethrough it, and so that the generator is heated, not merely by itscontact with or proximity to the lower portion of the body of thefurnace, but also by the escaping products of combustion passing throughit. Thus the products of combustion may either passthat is, when anatural draft is required--direct from the top of the cupola, which iscovered, by or through a main upper outlet, I, to the chimney J onopening a damper, r; or said products may be forced to pass through theinjector H down into a box, K, with which the fiues 6 connect at theirtop, and from thence down through said fines to a lower box, from whichis an outlet, L, that connects with the chimney J below. This draft isquickened by the steam-injector H to produce the necessary blast to thefurnace; and, as said injector is supplied with steam from the generatorG, the furnace is accordingly made to maintain its own blast. Saidinjector, of which 8 is the nozzle, may be constructed withan outerdrying case or shell for the steam, and inner reversely tapering body,substantially as described in Letters Patent No. 114,163, issued to meApril 25,- 1871.

Fig. 7 of the drawing shows a modified con struction of the generator G.Thus, instead of each vertical section being made to contain a singleflue, e, and annular water-space f, it is made to embrace a number ofsuch fines and water-spaces of other than annular shape.

What is here claimed, and desired to be secured by Letters Patent, is-

1. The combination, with a steam-generator heated by a reducing-furnace,of a steam-injector deriving its supply of steam directly from saidgenerator, and operating to pass the products of combustion of saidfurnace through the generator, and thence to the chimney or main outlet,as shown and described.

2. The steam-generator G made up of vertical sections arranged to form ajacket on the outside of the shell of the furnace, and provided withdraft-fines c and water-spaces f, in combination with an upper outlet,I, from the furnace, a steam-injector, H, a lower escape passage oroutlet, L, the chimney J, and a lower air-supply opening or openings,(1, essentially as shown and described.

\Vitnesses: P. W. MACKENZIE.

FRED HAYNES, FERD. TUSOH.

